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- Newsgroups: comp.sys.amiga.datacomm
- Path: sparky!uunet!mcsun!ieunet!tcdcs!maths.tcd.ie!ecarroll
- From: ecarroll@maths.tcd.ie (Eddy Carroll)
- Subject: Re: 1200/75 Comms Progs
- Message-ID: <1992Dec23.023449.12641@maths.tcd.ie>
- Organization: Dept. of Maths, Trinity College, Dublin, Ireland.
- References: <olsen.7025@sourcery.mxm.sub.org> <1992Dec15.195746.25484@ninja.zso.dec.com>
- Date: Wed, 23 Dec 1992 02:34:49 GMT
- Lines: 20
-
- ridder@zowie.zso.dec.com (Hans) writes:
- >My guess is that it sets the port for 1200 baud, and transmits at
- >75 baud using timed "breaks." I don't know if it's possible to do this
- >in a hardware independent manner.... Most probably it hits the hardware
- >directly.
-
- It is indeed possible to do this in a hardware independent manner,
- assuming that the OS can transmit characters as a continuous stream
- with no breaks inbetween each character (usually true).
-
- The general technique is to transmit a block of 16 characters at 1200
- baud which look similar to the bit-pattern generated by a single
- character sent at 75 baud. It's not perfect, but it works reliably with
- most 1200/75 modems out there. If anyone wants some example code,
- drop me a line.
-
- Eddy
- --
- Eddy Carroll ----* Genuine MUD Wizard | "You haven't lived until you've
- Internet: ecarroll@maths.tcd.ie | died in MUD!" -- Richard Bartle
-